Typewriting machine



. p 13! w A DOBSON TYPEWHITING MACHINE Filed Dec, 5, 1922 2 Sheets-Sheet 1 Wye/72W. 9% M4. 34%,

away Magi} 2 Sheets-Sheet 2 Sept. 13,1927. w A. DOESQN TYPEWRITING momma Filed Dec.

Patented Sept; 13, 1927.

UNITED STATES WILLIAM A. DOIBSON, OF BRIDGEEF'ORT, OQNNECTICUT, .ASSIGHOR T UNDERWOOD TYPEWRITER COMPANY, OF NEW" YGRK, N. 55., A (1012113035.

ION OF DELAWARE.

TYPEWRITING MACHINE.

Application filed December The present invention relates to typewrit ing machines. As to certain features thereof, the invention more particularlv relates to machines of the so-callcd portable cl and to machines in which the platen riage has its movements in letter-feed and return directions on a case-shift. frame; the latter being guided by the main frame in its movements between case positions.

Machines of the portable class not only receive rough treatment in being conveyed from place to place by the user, but are often delivered by express or parcel post, and in the course of such delivery are thrown violently about. Because of the inertia of the carriage and shiftframe, such treatment of the machine often causes the screws, and other elements which hold the parts to gether, to be strained and distorted, and the parts to be jammed or thrown out of true alignment or registry.

One feature of the invention is the provision of means for adjusting the ole firm or other setting of the carriage on the frame properly to present the platen to the types, or for other reasons; while nevertheless maintaining the usual roller bearing of the carriage on its supporting rail. In the preferred form of the invention. I effect this object by journaling the roller in an arm pivotally connected to the carriage (instead of, as heretofore journaling the roller directly on the carriage), and by employing an adjusting screw on the carriage in engagement with the arm micrometrical adjustment is provided for swinging; the. arm on its pivot; thereby using the roller on its rail as a fulcrum on which the arm, as a lever, may lift and lower the carriage.

The case-shift frame must be guided, without undue lateral play, in its movements between case positions. The inertia of the carriage, whether by reason of shock received in the handling of the machine, or of shock due to the movement thereof b the drum spring, has heretofore resulted uncentering of the shift-frame, jamming of the same on its guides, and distortion of screws or other retaining parts. 7 I

Another feature of the invention is the 5, 1922. crial No. 605,006.

provision of means for buttressingr the settino; of the shift-frame, on a guide rail therefor. such that the setting ma not be d sturbed. or screws. or other attachments, strained. by shocks due to' the jumping of the carriage bv its drum spring, or to rough handling of the machine.

in the preferred fo m of theinveution, the hift-frame has a roller bearing on the riaht-hand side of a rail which guides the "hif framc in its movements between case positions. A sl de which carries the roller is adius ab e on the shift-frame perpendicua lr to the rail, and. for-this purpose, has a screw-and-slot enogao ment with the shiftframe. wherebv the slide and roller mav be locked in a, vstcd p sitions. For relieving): this screw of strains. I provide wedge movable on the case-shift frame into position behind and tiehtlv ac'ainst the slide, after the latter has been set. l

A further feature of the invention is a novelsefiicicnt and simple locking device for the cast i ft lever: which device is certain in its locmno action. and is releasable with rcrta ntv noon more pressure on the shiftli'ov-lever when return to lower-case position is desired. 7

Other features and advantages will. herein ftor appear.

Tn the accompanvino; drawings.

Fieure l is a top plan view of so much of the mechanism of an Underwood standard portable tvpewr ter involves the presnt invention.

Figure 2 is view, in front elevation, talz n on the line 52 E2 of Figure 1.

Fienre 3 is aview. in side elevation, partlv cross-sectional, taken on the line 3- -3 of Fio'ure-L Picture 4 is a view. in side elevation. of the upper-case shift-key and lock mechanism the efor.

FlQ'lllQ 5 is detail view in front elevation. showing the means for holding against displacement the rail on the shift-frame on which the forward part of the carriage rims.

Figure 6 a detail view,in front elevation, partly cross-sectional, on the line 66 of Figure 3, of the adjustable mounting for the rail on the shift-frame which supports the forward part of the carriage.

The main frame of the machine is set within and screwed to an outer ornamental frame 11. The main frame comprises side pieces 12 tied together by cross-pieces 13 and 14, one in front of the other. The platen case-shift frame, comprising right and left hand side plates 15 and a rear crossplate 16, is mounted for movement up and down, between three case positions, in the main frame. The case-shift frame is sup ported and guided in its case-shift movements by means of right and left hand arms 17, fast at their rear ends to a rock-shaft 18 pivotally mounted in the main frame, and having at their forward ends pins 19 set in recesses 20 in the forward lower edges of the side plates 15 of the case-shift frame, and on which pins the forward portion of the case-shift frame is supported. For further supporting and guiding the case-shift frame in its case-shift movements are another pair of arms 21 pivoted at 22 to the side plates of the main frame at the rear thereof, and pivotally connected at their forward ends at 23 to the forward upper portions of the side plates 15 of the case-shift frame.

The side plates 15 of the case-shift frame, at their lower edges, have flanges 24 offset inward thereon, and, when the case-shift frame is in its normal or lower-case position, it is supported, by means of these flanges 24, on screws 25 adjustably set into ears 26 on brackets 27, secured by screws 28 to the rear cross-piece 14 of the main frame. The brackets 27 have also upstanding arms 29 offset at 30 at their upper ends to form ears which carry adjustable screws 31, also for engagement with the flanges 24 to determine the upper-case position of the shift-frame. The middle-case posit-ion of the shift-frame is determined by screws 32 adyustably set into ears or offsets 33 on the upper ends of arms 34, pivoted at 35 to the main frame, one at each side thereof. lVhen the shiftframe is thrown by the middle-case key, inturned ears or offsets 36, formed on the lower edges of the side plates 15 thereof, engage the screws 32, and the case-shift frame is thereby arrested in middle-case position. By means presently to be described, the stop arms 34 are thrown to move the stop-screws 32 from the path of the cars 36 of the easeshift frame when the latter is to be thrown to upper-case position. The arms 84, one at each side of the machine, form with the cross-piece 37 a bail which is normally held in Figure 3 position, and which is returned to Figure 3 position by a spring, not shown, but which connects the cross-piece 37 at one end thereof to one of the side pieces of the main frame.

For throwing the case-shift frame to middle-case position a key 38 is employed. This key is on' a lever 39, pivoted at 40 to a bracket 41 fast to th cross-piece 13 of the main frame. Rear-ward of the pivot 1-0 the lever 39 has an arn which underlies an offset 43 on the right-hand side of an arm 44 fast tothe rock-shaft 18. Consequently, depression of the key 38 causes the arm 42 to rock the arm 44 upward and to turn the rockshaft 18 accordingly. The arms 1'5, which support the caseshift frame, and which are also fast to the rock-shaft 18, are, therefore, also rocked upward, causing the case-shift frame to rise until the ears 36 on the side plates thereof engage the stop-screws 32 and determine the middle-case position. A spring 45, fast one end to the lever-arm 42 and at its other end to a bracket 46 se cured to the cross-piece 13, returns the middle-case-shift lever to normal position, as determined by an adjustable stop-screw on the bar 13, when free to do so. This lever is, however, provided with a locking device for holding it in middle-case position when desired. The locking device comprises a lever 47 pivoted at 48 to the shift-lever 39; the lever 47 having at its forward end an upright 50 terminating in a finger-piece 51, and having at its rearward end an arm 52 which forms a bell-crank therewith. The lock-lever 47 is normally held in, and is returned to, its Figure 3 position means of a spring 53 secured at one end to the lock-lever arm 52 and at its other end to the shift-key lever 39.

An offset 54 on the forward end of the lever 47, by engagement with the under edge of the shift-key lever 39, determines the throw of the lock-lever under the action of the spring and an offset 55 on the rear edge of the upright 50 on the f :nt of the lock-lever, by engagement with the upper edge of the shift-key lever '39, causes the lock-lever to pick up and carry with it the shift-key lever after the finger-piece 51 on the lockdever 47 has been depressed a sufii cient distance. A bracket 56, secured to the main frame. has a slotted plate 5. at the upper end thereof to receive the lock-lever arm 52, and this slot terminates at a shelf 58, under which a shoulder 59 on the locklever may pass, and by means which the lock-lever may be held down and the shift key lever held in CldPlGFSQtl or middle-case position. When the case-shift lever is depressed by the key 38, it carries with it the lock-lever 47, but does not effect sufficient movement of the lock-lever to br ng the shoulder 59 under the holding shelf or detent 58. lVhen, however, the ting: r-piece 51 of the lock-lever is depressem that lever has a movement which is independent of the shift-key lever until the oflfset reaches the shift-key lever, and then has a movement with the shift-key lever until the for ward edge of the lock-lever arm 52 strikes against the shelf 58. Further pressure at this time upon .the finger-piece 51 causes the arm 52 of the lock-lever to force down the shift-key lever in such manner that the shift-key lever is cleared of the offset 55 on the lock-lever. As the shift-key lever is thus forced down, drawing with it the lock lever arm 52, the shoulder 59 on the latter presently gets below the shelf or detent 58, and the clearance at this time between the offset 55 of the lock-lever and the upper edge of the shift-lever permits a rocking movement of the lock-1ever relative to the shift-lever, to permit the shoulder 59 to be brought under the shelf or detent 58, where it is held by friction due to the tension of the return spring 45 of the shift-lever. The spring of the shift-lever and of its connectlons is, however, such. that, when pressure is applied to the key 38, the frictional hold of the lock-lever on the shelf or detent 58 is released, so that the lock-lever, under the action of its spring 53, may be cleared of the detent 58, and the case-shift frame and case-shift lever allowed to return to normal position.

For moving the case-shift frame to uppercase position, there is provided a key 60 on the forward end of a lever 61, pivoted at 62 to the bracket 41. Rear-ward of the pivot 62 of the lever 61 is extended an arm 63, which underlies and is adapted to have a wiping engagement with a curved block 64 pinned to the left hand side of the arm 44. The effective arm 63 on the upper-case-shift lever 61 is longer than the effective arm 52 on the lower-caseshift lever, and effects a throw of the case-shift frame suiiicient to bring the flange 24 thereof to the stop-screw 31 which determines the upper-case position.

For throwing the middle-case stop-arms 34 and screws 32 out of the path of the stops 36 on the shift-frame, when the upper-caseshift lever is actuated, there is secured to the cross-piece 37, on which the arms 34 are carried, an arm 65 having on its upper end a roller 66. Thisroller lies .in the-path of a curved lug or cam 67, formed as an earon a bracket 68 secured by screws 69 to the s de of the uppercase-shift lever 61. The parts being in the normal or Figure 3 position depression of the key 60 causes the lug 6'1 to depress the arm 65 and rock the bail, pf which the arms 34 form part, around its pivot 35 in such direction as to throw the stop-screws 32 on the arms 34 forward of the stops 36 on the case-shift frame. The shift-lever 61 is supported in normal position by the roller 66 and arm 65.

The uppercase-shift lever is also provided with. a device for locking it, and the caseshift frame, in upper-case position. This locking device comprises a lever 70, pivoted at 71 to the case-shift lever 61. At its for ward upper end, the lock-lever 70 carries a finger-piece 72; and, rear of its pivot 71, is extended in the form of an arm 73. The locking device for the uppercase-shift lever also comprises an arm 74, similar in some respects to the arm 52 which looks the midrile-case lever, but which is not an integral part of the lo-clele'ver 70. The lock-arm 74 is pivoted at 71 independently of the lock-lever 70. A finger 75, forming a lower extension of the arm 74 below the pivot 71, is, however, connected with the arm or tail 73 of the locklever 70 by a spring 76; so that, when the finger-piece 72 is depressed to rock the arm 73 rearward, the spring 76 causes the arm 74 to swing forward as a unit with the lock-lever 70 until the arm 74 strikes against a shelf or detent 77, similar to the shelf or detent 58, on the upper end of the bracket 56. The spring 76 thereupon yields to permit of'further movement of the lock-lever 70 around its pivot 71 to bring a finger 80, thereon, to the shift-lever. Continued depression of the key 72 causes the shift-lever to be depressed by the lock-lever 70, carrying with it the arm 74, which now slides down along the shelf 77, until a shoulder 81 on the arm 74 is free to be snapped under the shelf 77 by the tensioned spring 76. This occurs as the shift-lever completes its case-shift move ment.

If the fingerpiece 72 be then released, the parts will nevertheless remain in upper-case position, by reason of frictional engagement of the shoulder 81 with the ledge or detent 77, due to the weight of the case-shift frame and c rriage. To unlock the parts, it is simply necessary to press upon the key 60. Because of the yield of the parts, this pressure relaxes the pressure of the shoulder 81 on the ledge or detent 77 sufficiently to permit a spring 78, connected at one end to the arm 74 and at its other end to the shift-lever 61, to return the arm 74 to Figure 4position. The arm 7 4, in moving to Figure 4 position, acts through the spring 76, to return the locklever 70 to its normal position with respect, to the shift-lever, as determined by engage; ment of an offset 79, on the lock-lever, with the under edge of the shift-lever. The relative strength of the springs 76 and 78 is such that normally, and except when the arm 74 is pressed against the shelf 77, the spring 76 will hold the arm 74 against a stop 82 on the lock-lever 70. Instead of operating the shift-lever by means of the lock-lever fingerpiece, the shift-lever may be operated by its key 60; and, while it is depressed, the fingerpiece 72 may be depressed to rock the locklever 70 with respect to the shift-lever in such manner as to tension the spring 76 and throw the lock-arm 74 forward to cause the shoulder 81 thereof to engage under the ledge or detent 77.

frame from one to another case position.

The side plates 8% are connected by crosspiece or tie 85 at the rear, and by another cross-piece or tie 86 below the platen. The cross-piece 86 is supported by roller-bearings 87 on a rail or runway 88 secured to the case-shift frame. A roller 1&2, carried by a bracket-arm 118, secured to the cross-piece 86, engages the under .side of the rail 88 to hold the forward part of the carriage to the rail 88, and taus obviates any tendency of the cross-piece 86 to overrun the roller-bearings 87 toward the rear of the machine, and consequent displacement of the platen-carriage. The carriage cross-piece 85 carries a roller 89, by means of which the carriage is supported at its rear on a rail 90 formed on the upper edge of the rear cross-piece 16 of the case-shift frame. 7

It is a. feature to lave the case-shift element 88 adjustable so that the platen may be made truly parallel with the printing plane of the types, that is, so that the platen may be trued relatively to the printing types, whereby the types (arrested by the usual abutment when in printing position) may strike with equal force on the platen throughout its length. To this end, the rail 88 is not made fast directly to the side plates 15 of the case-shift frame, but is attached at its ends, by means of screws 91, to a flange or arm 92 forming part of a U- shaped piece or slide 93 set against the inside face of the corresponding side plate 15 of the ca e-shift frame. A screw 94, passing through a horizontal slot 95 in the side plate of the case-shift frame, threads into the central member 96 of each U piece. lVhen the screws 91 are loosened, the U pieces, with the rail 88 attached thereto, may be adjusted forward and rearward, and, when so adjusted, and the rail 88 is parallel to the rail 90, the rail 88 will be held in such adjusted position upon tightening of the screws For effecting the adjusting movement of the LE piece-'= and attached rail 88, the forward flange; or arms 97 of the U pieces are in threaded engagement with screws 98. These screws, by means of their heads 99 and collars 100, are held fast to ears 101 stamped or turned inward out of the side plates 15. Upon revolution of the screws 98 in one or the other direction, therefore, the rail 88, at one or the other, or both ends, is moved forward or backward. Locknuts 102 on the screws 98 maintain the adjustment. To provide guideways for the U sections 96 and to assure horizontal. movement thereof, bosses 108, preferably four of them, as shown in Figures 3 and 6, are

pressed or sheared inward out of the body of the side plates of the shift-frame.

In order that the rear portion of the carriage may be adjustable upward and downward with respect to the rail 90, so as to bring the platen forwardly and rcarwardly to roper position with respect to the types 101, the foElowing means is provided. The aXle of the roller 89 is not directly mounted upon the rail 85. As shown in Figure 2, the axle 105 of the roller 89 is revolubly sup ported in an arm 106 pivotally attached at 107 to an ear 108 depending from the forward edge of the rail 85. Adjustable connection of the arm 106 to an ear 109 is formed by a slot 110 in the arm 106 and by a screw 111 which pas 'eii. through the slot 110 and threads into the ear 109. lVhen the screw is loosened, the arm may be lifted or lowered to adjusted position, and, when the screw 18 tightened, is-held in such adjusted position. For efiecting the adjusting movements, there is a screw 12 which is threaded through the cross-piece 85 and which is adapted to bear upon an ear or offset 113 on the arm 106. When the screw is withdrawn upward, the weight of the carriage causes the arm 106 and roller 89 to follow the screw. lVhen the screw is turned downward against the ear 118, the arm 106 and roller 89 are pressed down and the crosspiece in rear of tl e carriage corre pondingly elevated on the rail 90. A lock-nut 114i holds the screw 112 in adjusted position. It will be understood that the roller 89 at all times rests upon the rail 90, and that the axis of the roller serves as a fulcrum around which the arm 106, as a lever, lifts or lowers the carriage as the screw 112 is turned. For anchoring the carriage to the rail 90, so that the same may not be lifted clear thereof, the arm 106 has an ear or lug 115 turned under the rail 90 from the lower edge of the arm.

As a guideway or guide for the shiftframe in its up-and-down movements on the main frame, there is attached to the rear cross-piece 116 of the outside or ornamental frame 11 a vertical arm or rail 117. This rail is secured by screws 118 to a boss 119 on the inner face of the cross-piece 116. The arm or rail11'i' is further anchored against displacement on the boss 119 by ears 120, which are formed on the arm 11"? and which embrace the boss 119. A roller 122, carried by a bracket 123 secured to the inner face of the rear cross-piece 16 of the shiftframe, is adapted to bear against the righthaud side of the arm or rail 117; and an ear or flange 12 1, on the left-hand side of the rail 117, struck out of the crosspiece 16, defines, with the roller 122, the runway in which the arm or rail 117 has movement with respect to the case-shift frame in the case-shift movements of the latter. lVhereas the roller 122 is intended to bear upon the rail 117, the rail 117 will ordinarily not bear upon the car 124; the latter serves rather as a guard than as abearing for the rail 117. For correctly positioning the roller 122 with respect to the rail 11?, the bracket 123, on which the roller 122 is journaled, is longitudinally adjustable on the shift-frame cross-piece 1b. This adjustability is obtained by having horizontal slots 125 in the cross-piece 16 and by having screws 126 passed throughihese slots and threaded into the bracket then the screws are loosened, the bracket 123, with the roller, maybe adjusted perpendicularly to the edge of the rail 117 and, when such adjustment has been effected, the screws may be tightened to hold the bracket and roller in adjusted position.

The usual carriage drunrspring (not shown) tends to throw the carriage to the left, and the inertia of the carriage, when thrown under the impulse of the drumspring, tends to displace or force the shiftframe leftward with respect to the main frame. As the roller 122 bears upon the right-hand side of the guide-rail 117, such leftward displacements of the shift-frame tend to cause the roller to be dislocated by the rail 117, or to be jammed with respect thereto. The screws 126 tend to resist this action, but these screws sometimes fail to hold, or themselves become distorted; and it is desirable to relieve them of these strains. For this purpose, and also for adjusting the bracket 123, there is provided, at the righthand side of the bracket 123, a block 127. lVhen this block is in place, it abuts the end of the bracket 123 and holds the same fixed against rightward movement. The block 127 is inthe form of a wedge, and the end of the bracket 123, which abuts the block, is cut at the same incline as the wedge surface of the block. The block is adjustable up and down upon the inner face of the crosspiece 16 of the shift-frame, thereby providing simple means for holding the bracket 123 and for obtaining proper adjustment of said bracket to bring the roller 122 into co-operative relation with the rail 117. For this purpose, there is provided a .vertical slot 128 in the cross-piece 16, and a screw 129 passes through this slot and threads into the block. WVhen the screw is loosened, the block may be moved up and down, and, when tightened, the block is held in place. In fixing the parts, the block is held up while the position of the bracket 123 and roller 122 is determined and fixed by the screws 126. Thereupon the blockis forced down until it is wedged firmly against the end of the bracket 123, after which the screw 129 is tightened.

As hereinbefore described, the rail 88, on which the forward part of the carriage rides, is held to the shift-frame by means of the screws 91. It has been found that, in spite of the screws 91 or other screw attachments, the rail 88 frequently gets knocked up or down from its true position on the shiftframe; usually because of inertia of the carriage and the shocks to which the machine is subjected in transportation. To relieve the screws 91 and other connections of the rail 88 to the shift-frame of the work of meeting such shocks, and to prevent distortion and displacement of the rail and its connections, due to such shocks, the following device is provided.

A bracket 130 (see Figure 5) is secured by a screw 131 to the front face of the rail 88 at each end thereof. Each bracket is horizontally slotted as at 132, and the screw 131 passes through the slot and threads into the rail. When the screw is loosened,=the bracket maybe moved longitudinally of the rail. Each bracket carries, or has as part thereof, a block 133 which is set against the under edge of the rail between the latter and a shoulder 134 formed in the corresponding side plate 15 of the carriage-shiftframe. As shown in Figure 5, the under surface of the block is tapered as at 135, so that, when the screw 131 is loosened, the block may be moved so as to be wedged between the shoulder 134; of the plate and the rail 88, thereby relieving the screws 91 and other connections of the rail to the shiftframe of strains due to downward pressure of the carriage. The rail is also blocked against upward movement. For this purpose, there is at each side of the machine a bracket 136 secured to the shift-fra1ne by a screw 137 and also held against upward movement on the shift-frame by an car 138, which is struck upward from the top edge of the shift-frame and against which the upper edge of the bracket 136 abuts. The bracket'136 has a finger or tongue 139 thereon, which is extended rearward to overlie and bear upon the upper edge of the rail 88. As shown in Figure 3, this finger 139 may be slightly ofiset downward at its end, or made thinner at its end, as at 140, to provide ample clearance for the forward edge or lip of the carriage cross-piece 86. The side plates 15 of the case-shift frame are slotted where they receive the screws 137-, and these slots, and the ears 138, are at a downward and rearward incline, so that, if the screws 137 are loose, the brackets 136 and fingers 139 will be pressed or cammed down on the top edge of the rail 88 upon rearward movement of the brackets 136. After the fingers 139 have been thus firmly set upon the rail 88, the screws 137 are tightened to hold the fingers in place. The fingers 139, as shown in Figures 3 and 5, therefore, relieve the screws 91 and other connections of the rail 88 of strains tending to force the rail upward.

It has been hereinbefore stated that a spring, not shown, by drawing on the bail cross-piece 37, returns the stop-arms 34: to normal position when the upper-case-shift key is released. It occasionally happens, particularly if the hand is on the platenknob, that the spring mentioned throws the arms 34 to normal position before the stopears 36 on the shift-frame have had an opportunity to pass the ears 33 on the stoparms 34;. If this should happen, the caseshift frame, instead of returning to normal position, would come to rest with the ears 36 thereof on top of the ears 33 of the stoparms 34. To prevent such an occurrence, the ears 36 on the shift-frame have lips 1 2 i depending from the forward edges thereof. These lips are of a length snfiicient, when thecase-shift frame is in upper-case position, to cross the path of rearward movement of the ears 33 on the arms 3%; thereby preventing passage of the cars 33 under the ears 36, and assuring return of the caseshift frame to lower-case position without being interfered with by the stop-arms 3%.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim: I

1. In a typewriting machine, a platen, a case-shift frame for the platen, a key and lever for shifting the former, and means for locking the shift-lever with the frame in shifted position, including a lock-lever and a key therefor, pivoted to the case-shift lever, an arm or dog mounted on the pivot of the lock-lever, a stop engageable by the ari or dog, and a spring connecting the locklever directly to the arm or dog to cause the arm or dog to move, as a unit, with the locklever until the arm or dog strikes the stop and thereupon to yield to permit further movement of the lock-lever with the shiftlever.

2. In a. typewriting machine, a platen. a case-shift frame for the platen, a key and lever for shifting the frame, and means for locking the shift-lever with the frame in shifted position, comprising a lock-lever, and a key therefor, pivoted to the case-shift lever, an arm or dog pivoted to the caseshift lever and movable thereon relatively to the lock-lever, a stop engageable by the arm or dog, a spring connecting the locklever and the arm or dog to cause the arm or dog to move with the lock-lever until the arm or dog strikes the stop and thereupon to yield to permit further movement of the lock-lever with the shift-lexer, and a stop on the lock-lever against which the arm or dog sets until the arm or dog strikes the first-mentioned stop.

3. In a typewriting machine, a platen, a case-shift frame for the platen, a key and lever for shifting the frame, and means for locking the shift-lever with the frame in shifted position, including a lock-lever and a key therefor, pivoted to the case-shift lever, an arm or dog mounted on the pivot of the lock-lever, a stop engageable by the arm or dog, a spring connecting the locklever directly to the arm or dog to cause the arm or dog to move, as a unit, with the lock lever until the arm or dog strikes the stop and thereupon to yield to permit further movement of the lock-lever with the shiftlever, and a spring connecting the arm or dog to the shift-lever to automatically re turn the arm or dog and lock-lever to normal position, when said arm or dog is released from the stop. 7

at. In atypewriting machine, a platen, a case-shift frame for the platen, a key and lever for shifting the frame, means for automatically returning the shift-lever to normal position when the shift-lever is released, and means for locking the shift-lever with the frame in shifted position, including a lock-lever and a key therefor, pivoted to the case-shift lever, an arm or dog mounted on the pivot of the lock-lever and movable on said pivot relatively to the lock-lever, a stationary stop cngageable by the arm or dog, said lock-lever and said dog each including an extension on the opposite side of said pivot, a stop carried by the lock-lever, a spring connecting the extensions to cause the arm or dog to engage the stop of said locklever and to move with the-same, as a unit, until the arm or dog strikes said stationary stop and thereupon to yield to permit further movement of the lock-lever with the shiftlever while the arm or dog slides on the side of the stop; the arm or dog having a shoulder to be automatically snapped under the stop, by the spring, as the shift-lever completes its case-shifting operation, and to be held frictionally to the stop, on release of the key, by the means for returning the case-shift lever to normal position, and a spring for throwing the arm or dog from the stop when such frictional hold is relaxed by pressure on the case-shift lever key at a time when the locklever key is released.

5. In a typewriting machine, a platen, a case-shift frame for the platen, a lever for throwing the case-shift frame to a middlecase position, a stop for determining the middle-case position of the shift-frame, a lever for throwing the case-shift frame to an upper-case position, a curved lug on the upper-case shift-lever, and an arm on the middle-case stop having a roll thereon engageable by the curved lug to rock the stop to ineffective position when the upper-case shiftlever is operated.

6. In a typewriting machine, a main frame. a case-shiftframe movable between case position on the main frame, a platen- IOU elf)

carriage mounted to run on the case-shift frame, a guide rail for the case-shift frame on the main frame, a roller on the case-shift frame for engagement with one side of the rail, a guard for the oppositeside of the rail, a block or slide carrying the roller and having a screw-and-slot engagement with the case-shift frame for. adjustable setting of the roller against the rail, and means for blocking the roll'carrying slide, after the same has been secured in place, to reinforce and protect the attaehi'nents of the slide to the case-shi ft frame.

7. In a typewriting machine, a main frame, a case-shift frame movable between case positions on the main frame, a platencarriage mounted to run on the case-shift frame, a guide rail for the case-shift frame on the main frame, a bearing piece on the caseshift frame for engagement with one side of the rail, a guard for the opposite side of the rail, means supporting the hearing piece for adjustment thereof with respect to the rail, means for securing the support in adjusted position, and means for blocking the bearing-piece support to reinforce and protect the attachments thereof.

8. In a typewriting machine, a main frame, a caseshift frame movable between case positions on the main frame, a platencarriage mounted to run on the case-shift frame, a guide rail for the case-shift frame on the main frame, a bearing-piece on the case-shift frame for engagement with the rail, means supporting the bearing-piece for adjustment thereof with respect to the rail, means for securing the bearing-piece in adjusted position, and means for adjusting and then blocking the bearing-piece to reinforce and protect the attachments thereof, said blocking means including a wedge on the c shift frame movable behind, and into sliding engagement with, the bearing-piece to adj ustably move the same toward said rail before said bearing-piece is secured in adjusted position.

9. In a typewriting machine, a main frame, a case-shift frame movable between case positions on the main frame, a platencarriage mounted to run on the case-shift frame, a guide rail for the case-shift frame on the main frame, a bearing piece on the case-shift frame for engagement with the rail, means supporting the bearing piece for adjustment thereof with respect to the rail, means for securing the support in adjusted position, and means for blocking the bearing-piece support to reinforce and protect the attachments thereof, said blocking means comprising a wedge having a screw-and-slot engagement with the case-shift frame to be movable behind, and into engagement with, the bearing-piece support after the latter is secured in adjusted position, and to be locked in place by the screw.

10. In a typewriting machine, a platencarriage, a V-shaped lower rail providing a lower raceway, one side of the V facing to.

ward the front of t e machine, rollers in said raceway, an upper V-shaped rail on the platen-carriage and providing an upper raceway for said rollers, a bracket attached to the platen-carriage, and anti-friction means carried by said b *acket and disposed around the lower rail in engagement with the front facing side of the lower rail, whereby to slidingly hold the platen-carriage to said lower rail and to prevent the platen-carriage from being displaced toward the rear of the machine.

11. In a typewrit-ing machine, type-bars and types thereon, a platen, a platen-can riage, a rail on which the carriage runs, a roller for supporting the carriage on the rail, an arm pivoted to the carriage and carrying the roller, and means for adjusting the arm u i and down to adjust the position of the platen with respect to the types; the arm having a lip thereon offset under the rail for holding the carriage to the rail.

12. In a typewriting machine, a platen case-shift frame, a rock-arm for lifting the same, an offset on one side of the arm, av lever engageable with the offset for rocking the arm to throw the case-shift frame to one case position, a rounded block on the other side of the arm, and a lever adapted to have a wiping engagen'ient with the block to rock the arm to throw the case-shift frame to another case position.

13. In a typewriting machine, a case-shift frame, a lever for shifting the frame to a middle-case position, an ear or lug on the case-shift frame, an arm engageable by such ear or lug to arrest the ruse-shift frame in middle-case position when the middle-caseshift lever is operated, an upper-case-shift lever, means whereby the upper-case-shift lever throws the middle-case stop-arm out of" the path of the ear or lug on the case-shift frame to permit movement ofthe case-shift frame to an upper-case position when the upper-case lever is operated, means for returning the middle-case stop-arm to normal position when the upper-case-shift lever is released, and means for preventing the middle-case stop-arm from crossing the path of the ear or lug on the case-shift frame, when the upper-case-shift lever is operated, until after the ear or lug on the case-shift frame has passed the stop on the middle-case stop-arm, said last-named means being car ried by the caseshift frame.

14. In a typewriting machine, a case-shift frame, a lever for shifting the frame to a middle-case position, an ear or lug on the caseshift frame, an arm engageable by such ear or lug to arrest the case-shift frame in middle-case position when the middle-caseshift lever is operated, an upper-case-shift lever, means whereby the upper-case-shift lever throws the middle-case stop-arm out of the path of the ear or lug on the oaseshift frame to permit movement of the case-shift 5 frame to upper-ease position when the upper-ease lever is operated, means for returning the middle-case stop-arm to normal position when the upper-case-shift lever is 7 released, and a lip 0r boss depending from the ear or lug on the case-shift frame to block the return of the middle-case stop-arm to normal position until after the ear or lug on the ease-shift frame has passed the stop on the stop-arm on the return movement of the. ease-shift frame to normal position.

WILLIAM A. DOBSON. 

